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Section V UNIT MAINTENANCE PROCEDURES
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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General Cleaning Instructions.
TM 5-4210-220-12 4-9.  GENERAL MAINTENANCE PROCEDURES - Continued 4-9.1  General Removal and Disassembly Instructions - Continued g. Lifting Truck - Continued (4) Place 10 ton hydraulic jack beneath differential.  Raise the jack until tires clear the ground. (5) Place maintenance trestles beneath axle, one on each side of differential.  If truck is to be supported by frame, and tires still need to clear the ground, raise the truck high enough to compensate for leaf spring sag. (6) Carefully lower truck onto maintenance trestles.  Be sure maintenance trestles are adjusted to the same height and are of sufficient capacity to carry truck weight. (7) Repeat steps 4 thru 6 to raise other axle. h. Lowering The Truck (1) Place 10 ton hydraulic jack beneath differential.  Raise the jack until all weight is off maintenance trestles. (2) Remove maintenance trestles from beneath axle (one on each side of differential). (3) Carefully and slowly, lower jack until all weight is removed from jack immediately after truck is grounded, chock the wheels. (4) Repeat step 1 thru 3 to lower other axle as necessary. (5) Ensure  gear  selector  is  positioned  to  N  (neutral)  and  parking  brakes  are  applied,  then  remove  all  wheel chocks. j. Identification Identify all parts of similar shape with tags.  This will make proper reassembly easier.  Be sure to identify ends of electric, hydraulic, and air lines as they are disconnected. k. Salvage Some assemblies that are removed, even though defective, shall be treated as valuable items . They may be rebuilt for future use. l. Expendable Parts Whenever possible, all gaskets, packings, and seals shall be discarded during removal or disassembly.  Similarly, lock wire, lockwashers, cotter pins, and like items shall be discarded during disassembly.  All should be replaced during assembly.  When removing seals, gaskets, or packings, take care not to damage (e.g. scratch) the sealing surfaces if surfaces are damaged they must be repolished to give a good sealing surface. m. Parts Protection To prevent moisture and dirt from entering housings, lines, and other openings, apply protective covers after disassembly.  Wrap all parts in clean paper or dip parts in rust preventive oil. 4-58

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